myCompiler - Run your favourite programming languages online
CodePen - A front end web development playground.
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JSFiddle - Test your JavaScript, CSS, HTML or CoffeeScript online with JSFiddle code editor.
CodeChef IDE - CodeChef IDE is a free online tool for developers helping them in writing codes and programs.
Liveweave - Liveweave is a HTML5, CSS3 & JavaScript playground for web designers and developers